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Shell Programming and Scripting

Number of words in line, while loop, search and grep

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# 8  
Old 09-25-2018
Well, a representative input should be given then.
A smallest possible portion of your data which cover your request entirely.

Without that, it is not possible for person here to cover all cases magically.

Regards
Peasant.
# 9  
Old 09-25-2018
Quote:
Originally Posted by Peasant
Well, a representative input should be given then.
A smallest possible portion of your data which cover your request entirely.

Without that, it is not possible for person here to cover all cases magically.

Regards
Peasant.

Thank you Peasant

Regards
Boris
# 10  
Old 09-25-2018
Instead of "else if" and nesting deeper the shell has "elif" that remains on the same level.
Code:
if ... then ... elif ... then ... elif ... then ... else ... fi

But if each condition tests the same variable then it is more appropriate to use a "case-esac":
Code:
set -f
while read line
do
  set -- $line
  case $# in
  6) grep -B1 -w "$1 $2 $3 $4 $5 $6" fileB
  ;;
  5) grep -B1 -w "$1 $2 $3 $4 $5" fileB
  ;;
  4) grep -B1 -w "$1 $2 $3 $4" fileB
  ;;
  3) grep -B1 -w "$1 $2 $3" fileB
  ;;
  2) grep -B1 -w "$1 $2" fileB
  ;;
  *)
  esac
done < fileA

This User Gave Thanks to MadeInGermany For This Post:
baris35
# 11  
Old 09-25-2018
Dear MadeInGermany,
Thanks for your answer. It worked at my end with expected result
I have just sorted out by trying another way. As I could not have handle it with previously explained way by other valuable board members, I replaced space by underscore in all my source files. By this way, fileA turned to one colon lines. Then I ran below script. And at last, replaced underscore by space once again to turn output file to expected view:

Code:
#!/bin/bash
while read COL1
do
        count=`echo $COL1 | wc -w`
        if [ $count -eq 2 ]; then
                break;
        else
                grep $COL1 -B1 fileB
fi
done<fileA > fileC
sed -i 's/_/ /g' fileC

Many Thanks
Boris
# 12  
Old 09-25-2018
But how can $count be 2 then? Isn't it always 1?
And, if you put the $COL1 in quotes, you can again work with the original space-separated files, and it boils down to
Code:
while read line
do
  grep -B1 -- "$line" fileB
done <fileA

Last edited by MadeInGermany; 09-25-2018 at 04:17 PM.. Reason: options first ending with -- so a leading - in $line is allowed
This User Gave Thanks to MadeInGermany For This Post:
baris35
# 13  
Old 09-25-2018
You are right. I took into account another case but now I see that it is not possible.
I will be using the code which you posted.


Many thanks
Boris
# 14  
Old 09-25-2018
How far would the -f (file) option to grep get you?



Code:
grep -B1 -ffile1 file2
+2828288889999
L Aragon
--
+330022110033
J L Borges
+440011223344
T S Eliot

This User Gave Thanks to RudiC For This Post:
baris35
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